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The Polarbear-2 and the Simons Array Experiments

  • Author(s): Suzuki, A
  • Ade, P
  • Akiba, Y
  • Aleman, C
  • Arnold, K
  • Baccigalupi, C
  • Barch, B
  • Barron, D
  • Bender, A
  • Boettger, D
  • Borrill, J
  • Chapman, S
  • Chinone, Y
  • Cukierman, A
  • Dobbs, M
  • Ducout, A
  • Dunner, R
  • Elleflot, T
  • Errard, J
  • Fabbian, G
  • Feeney, S
  • Feng, C
  • Fujino, T
  • Fuller, G
  • Gilbert, A
  • Goeckner-Wald, N
  • Groh, J
  • Haan, TD
  • Hall, G
  • Halverson, N
  • Hamada, T
  • Hasegawa, M
  • Hattori, K
  • Hazumi, M
  • Hill, C
  • Holzapfel, W
  • Hori, Y
  • Howe, L
  • Inoue, Y
  • Irie, F
  • Jaehnig, G
  • Jaffe, A
  • Jeong, O
  • Katayama, N
  • Kaufman, J
  • Kazemzadeh, K
  • Keating, B
  • Kermish, Z
  • Keskitalo, R
  • Kisner, T
  • Kusaka, A
  • Jeune, ML
  • Lee, A
  • Leon, D
  • Linder, E
  • Lowry, L
  • Matsuda, F
  • Matsumura, T
  • Miller, N
  • Mizukami, K
  • Montgomery, J
  • Navaroli, M
  • Nishino, H
  • Peloton, J
  • Poletti, D
  • Puglisi, G
  • Rebeiz, G
  • Raum, C
  • Reichardt, C
  • Richards, P
  • Ross, C
  • Rotermund, K
  • Segawa, Y
  • Sherwin, B
  • Shirley, I
  • Siritanasak, P
  • Stebor, N
  • Stompor, R
  • Suzuki, J
  • Tajima, O
  • Takada, S
  • Takakura, S
  • Takatori, S
  • Tikhomirov, A
  • Tomaru, T
  • Westbrook, B
  • Whitehorn, N
  • Yamashita, T
  • Zahn, A
  • Zahn, O
  • et al.
Abstract

We present an overview of the design and status of the Polarbear-2 and the Simons Array experiments. Polarbear-2 is a cosmic microwave background polarimetry experiment which aims to characterize the arc-minute angular scale B-mode signal from weak gravitational lensing and search for the degree angular scale B-mode signal from inflationary gravitational waves. The receiver has a 365 mm diameter focal plane cooled to 270 mK. The focal plane is filled with 7588 dichroic lenslet–antenna-coupled polarization sensitive transition edge sensor (TES) bolometric pixels that are sensitive to 95 and 150 GHz bands simultaneously. The TES bolometers are read-out by SQUIDs with 40 channel frequency domain multiplexing. Refractive optical elements are made with high-purity alumina to achieve high optical throughput. The receiver is designed to achieve noise equivalent temperature of 5.8 μ KCMBs in each frequency band. Polarbear-2 will deploy in 2016 in the Atacama desert in Chile. The Simons Array is a project to further increase sensitivity by deploying three Polarbear-2 type receivers. The Simons Array will cover 95, 150, and 220 GHz frequency bands for foreground control. The Simons Array will be able to constrain tensor-to-scalar ratio and sum of neutrino masses to σ(r) = 6 × 10 at r= 0.1 and ∑ m (σ= 1) to 40 meV. - 3 ν

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